It looks something like an O2 sensor and is gray in color( on her car at least), but i'm very unsure of what it is. I noticed on my girlfriends car today that when i was checking fluids and had the car started, this "plug" was smoking as if it were burning oil off of it. Can anyone help me out?

 

ITs a secondary coolant sensor...

 

thanks you... any reason why is might be smoking? the smoke seems to be coming from the bottom of the sensor... any ideas?

 

maybe its leaking?

 

that or maybe a leak from the valve cover?

hard to say... starts getting tight around that area...

 

Sorry we are not more useful but this is kinda odd.

I woudl check to see if the smoke is coming form below it, if you are sure its that maybe replace it? can't be mroe then $10

 

thanks again guys... i'm pretty sure its the sensor leaking. i'm going to replace it anyways. a 10 year old car, it cant hurt to replace a sensor. thanks agian.